Magnetic integration device, low-voltage high-power adjustable power supply and low-voltage system

Abstract

The invention relates to the technical field of high-frequency switching power supplies, and mainly provides a magnetic integration device, a low-voltage high-power adjustable power supply and a low-voltage system, the device comprises a first inductance module consisting of a first magnetic ring, a second magnetic ring, a first coil and a second coil, and a second inductance module consisting of a third coil and a fourth coil; wherein the first coil and the second coil are both wound on the first magnetic ring, and the third coil and the fourth coil are both wound on the second magnetic ring. The first coil and the second coil are respectively connected with dotted terminals of secondary windings of the first transformer and the second transformer, and the third coil and the fourth coil are respectively connected with non-dotted terminals of the secondary windings of the first transformer and the second transformer. And the first coil and the second coil which are connected with the dotted terminals of the two transformers are wound on the same magnetic ring, so that the voltage oscillation at the two ends of the windings of the two transformers when the four coils use independent magnetic rings is eliminated through the magnetic coupling of the first coil and the second coil and the magnetic coupling of the third coil and the fourth coil.

Description

Technical Field

[0001] The invention relates to the field of high-frequency switching power supplies, and in particular to a magnetic integration device, a low-voltage high-power adjustable power supply and a low-voltage system. Background Art

[0002] In the application of high-power, low-voltage, full-range voltage regulation and high-current output power supply, the voltage drop of the secondary line has a significant impact on efficiency. High current puts higher requirements on the manufacturing process of the transformer, is also a challenge for the cooling of the transformer, and has higher requirements on the current rating of the rectifier diode or synchronous rectifier MOS tube. The current doubler rectifier circuit is evolved from the full-bridge rectifier circuit. The switch tube of one bridge arm in the full-bridge rectifier circuit is replaced by an inductor to transform it into a current doubler rectifier circuit. In the current doubler rectifier circuit, only one winding is needed for the secondary of the transformer. Compared with the full-wave rectifier circuit, which requires a winding with a center tap on the secondary, the current doubler rectifier circuit reduces the manufacturing difficulty of the transformer. The number of switching devices in the current doubler rectifier circuit is half of that in the full-bridge rectifier circuit. Under the same output current, the current flowing through the secondary winding of the transformer in the current doubler rectifier circuit is half of that in the full-bridge rectifier circuit. The average current of the two filter inductors in the current doubler rectifier circuit is only half of the output current, which reduces the output current ripple under the same conditions.

[0003] However, the two inductors of the current-doubling rectifier circuit increase the number of magnetic components and the size and weight of the power supply. When the primary winding of the transformer is connected in series and the secondary winding is connected in parallel, the resonance between the discrete filter inductor and the parasitic parameters of the transformer can easily cause voltage oscillation across the transformer winding. Summary of the invention

[0004] The embodiments of the present invention provide a magnetic integrated device, a low-voltage high-power adjustable power supply and a low-voltage system, which are conducive to solving the technical problem that in the existing low-voltage system with two transformer primary windings connected in series and secondary windings connected in parallel, voltage oscillation occurs at both ends of the transformer windings due to resonance between discrete filter inductors and transformer parasitic parameters during current doubling rectification.

[0005] A technical solution adopted in an embodiment of the present invention is: to provide a magnetic integration device, which is applied to a low-voltage high-power adjustable power supply, and the low-voltage high-power adjustable power supply includes a first transformer and a second transformer, and the magnetic integration device includes a first magnetic ring, a second magnetic ring, a first inductance module and a second inductance module. The first inductance module includes a first coil and a second coil, and the second inductance module includes a third coil and a fourth coil. The first coil and the second coil are coupled to each other, and the third coil and the fourth coil are coupled to each other. The first coil and the second coil are both wound on the first magnetic ring, and the third coil and the fourth coil are both wound on the second magnetic ring. The first coil and the third coil are also respectively connected to the secondary winding of the first transformer, and the second coil and the fourth coil are also respectively connected to the secondary winding of the second transformer, wherein the first coil is connected to the same-name end of the secondary winding of the first transformer, and the second coil is connected to the same-name end of the secondary winding of the second transformer. The first inductor module is configured such that when the same-name ends of the secondary windings of the first transformer and the second transformer output positive voltages, the current flowing through the first inductor module gradually increases, and when the same-name ends of the secondary windings of the first transformer and the second transformer output negative voltages, the current flowing through the first inductor module gradually decreases. The second inductor module is configured such that when the non-same-name ends of the secondary windings of the first transformer and the second transformer output positive voltages, the current flowing through the second inductor module gradually increases, and when the non-same-name ends of the secondary windings of the first transformer and the second transformer output negative voltages, the current flowing through the second inductor module gradually decreases. In some embodiments, the low-voltage, high-power adjustable power supply further includes a filter module, which is connected to the first inductor module and the second inductor module, and the magnetic integration device further includes a switch module, which is connected to the first transformer and the second transformer respectively, and the switch module is also connected to the first coil, the second coil, the third coil and the fourth coil respectively. The switch module responds to the positive voltage outputted from the same-named ends of the secondary windings of the first transformer and the second transformer, the positive voltage is applied to the first coil and the second coil, and the current flowing through the first coil and the second coil gradually increases under the action of the positive voltage, so as to output the current to the filter module through the first coil and the second coil. And the switch module responds to the positive voltage outputted from the non-same-named ends of the secondary windings of the first transformer and the second transformer, the positive voltage is applied to the third coil and the fourth coil, and the current flowing through the third coil and the fourth coil gradually increases under the action of the positive voltage, so as to output the current to the filter module through the third coil and the fourth coil.

[0006] In some embodiments, the switch module is used to control the current on the first coil and the current on the second coil to increase according to a preset increment according to the positive voltage output from the same-name end of the secondary winding, and the current on the third coil and the current on the fourth coil to decrease according to a preset decrease amount. And according to the positive voltage output from the non-same-name end of the secondary winding, the current on the first coil and the current on the second coil are reduced according to a preset decrease amount, and the current on the third coil and the current on the fourth coil are increased according to a preset increment.

[0007] In some embodiments, the switch module includes a first switch tube, a second switch tube, a third switch tube, and a fourth switch tube. The first end of the first switch tube is respectively connected to the same-name end of the secondary winding of the first transformer and the first coil, the second end of the first switch tube is connected to the first end of the second switch tube, the second end of the first switch tube is also connected to the filter module, the second end of the second switch tube is respectively connected to the non-same-name end of the secondary winding of the first transformer and the third coil, the first end of the third switch tube is respectively connected to the same-name end of the secondary winding of the second transformer and the second coil, the second end of the third switch tube is connected to the first end of the fourth switch tube, the second end of the third switch tube is also connected to the filter module, the second end of the fourth switch tube is respectively connected to the fourth coil and the non-same-name end of the secondary winding of the second transformer, and the first switch tube, the second switch tube, the third switch tube, and the fourth switch tube are also connected to the controller. The first switch tube, the second switch tube, the third switch tube and the fourth switch tube are all used to receive the control signal output by the controller and are alternately turned on according to the control signal, wherein the on-off state of the first switch tube is the same as that of the third switch tube, the on-off state of the second switch tube is the same as that of the fourth switch tube, and the first switch tube and the second switch tube are alternately turned on.

[0008] In some embodiments, the first coil and the second coil are wound in the same direction on the first magnetic ring. The third coil and the fourth coil are wound in the same direction on the second magnetic ring.

[0009] In some embodiments, the number of turns and inductance of the first coil are the same as the number of turns and inductance of the second coil. The number of turns and inductance of the third coil are the same as the number of turns and inductance of the fourth coil.

[0010] In order to solve the above technical problems, another technical solution adopted by the embodiment of the present invention is: to provide a low-voltage high-power adjustable power supply, which includes a phase-shifted full-bridge circuit, a transformer module, a filter module and the above magnetic integrated device. The transformer module includes a first transformer and a second transformer, the primary winding of the first transformer and the primary winding of the second transformer are connected in series, the primary winding of the first transformer and the primary winding of the second transformer are also respectively connected to the phase-shifted full-bridge circuit, the secondary winding of the first transformer and the secondary winding of the second transformer are connected in parallel and connected to the magnetic integrated device, the phase-shifted full-bridge circuit is used to receive the bus voltage, the magnetic integrated device is also connected to the filter module, and the phase-shifted full-bridge circuit is also used to connect to the controller. The phase-shifted full-bridge circuit is used to receive the drive signal output by the controller, and convert the bus voltage based on the drive signal to output the corresponding first voltage signal to the transformer module. The transformer module is used to receive the first voltage signal, and convert the first voltage signal to the second voltage signal according to the turns ratio of the transformer module, and then input it into the magnetic integrated device, so as to output it to the filter module through the magnetic integrated device.

[0011] In some embodiments, the same-name end of the primary winding of the first transformer is located at a first position of the first transformer, and the same-name end of the primary winding of the second transformer is located at a first position of the second transformer. The same-name end of the secondary winding of the first transformer is located at a second position of the first transformer, and the same-name end of the secondary winding of the second transformer is located at a second position of the second transformer.

[0012] In some embodiments, the winding structure and turns ratio of the first transformer are the same as the winding structure and turns ratio of the second transformer.

[0013] In order to solve the above technical problems, another technical solution adopted by the embodiment of the present invention is: to provide a low-voltage system, the low-voltage system includes: a controller, and the above low-voltage high-power adjustable power supply.

[0014] Different from the related art, the present invention provides a magnetic integrated device, a low-voltage high-power adjustable power supply and a low-voltage system. The magnetic integrated device includes a first magnetic ring, a second magnetic ring, a first inductance module and a second inductance module; the first inductance module includes a first coil and a second coil, the second inductance module includes a third coil and a fourth coil, the first coil and the second coil are coupled to each other, and the third coil and the fourth coil are coupled to each other; the first coil and the second coil are both wound on the first magnetic ring, the third coil and the fourth coil are both wound on the second magnetic ring, the first coil and the third coil are also respectively connected to the secondary winding of the first transformer, the second coil and the fourth coil are also respectively connected to the secondary winding of the second transformer, wherein the first coil is connected to the same-name end of the secondary winding of the first transformer, and the second coil is connected to the same-name end of the secondary winding of the second transformer. By winding the first coil and the second coil connected to the same ends of the first transformer and the second transformer on the same magnetic ring, the voltage oscillation at both ends of the transformer winding when the first coil, the second coil, the third coil and the fourth coil use independent magnetic rings can be eliminated through magnetic coupling between the first coil and the second coil and magnetic coupling between the third coil and the fourth coil.

[0015] The first inductor module is configured such that when the same-name end of the secondary winding of the first transformer and the second transformer outputs a positive voltage, the current flowing through the first inductor module gradually increases, and when the same-name end of the secondary winding of the first transformer and the second transformer outputs a negative voltage, the current flowing through the first inductor module gradually decreases; the second inductor module is configured such that when the non-same-name end of the secondary winding of the first transformer and the second transformer outputs a positive voltage, the current flowing through the second inductor module gradually increases, and when the non-same-name end of the secondary winding of the first transformer and the second transformer outputs a negative voltage, the current flowing through the second inductor module gradually decreases. The first coil and the second coil in the first inductor module form a magnetic coupling, and the third coil and the fourth coil in the second inductor module form a magnetic coupling. Based on this, the voltage oscillation at both ends of the transformer winding can be eliminated while outputting a preset voltage. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] One or more embodiments are exemplarily described by corresponding drawings, which do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and the figures in the drawings do not constitute proportional limitations unless otherwise stated.

[0017] Figure 1 It is a structural block diagram of a low-voltage system provided by an embodiment of the present invention.

[0018] Figure 2a This is a circuit diagram after the fifth switch tube and the eighth switch tube in a low-voltage, high-power adjustable power supply provided by an embodiment of the present invention are turned on.

[0019] Figure 2b This is a circuit diagram after the sixth switch tube and the seventh switch tube in a low-voltage, high-power adjustable power supply provided by an embodiment of the present invention are turned on.

[0020] Figure 3 It is a structural block diagram of a magnetic integration device provided by an embodiment of the present invention.

[0021] Figure 4 Schematic diagram of an inductor module provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0023] It should be noted that, if there is no conflict, the various features in the embodiments of the present invention can be combined with each other, and all are within the protection scope of the present invention. In addition, although the functional modules are divided in the device schematic diagram and the logical order is shown in the flow chart, in some cases, the steps shown or described can be performed in a different order from the module division in the device schematic diagram or the order in the flow chart.

[0024] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used in this specification includes any and all combinations of one or more of the related listed items.

[0025] See also Figure 1 , Figure 1 is a structural block diagram of a low voltage system provided by an embodiment of the present invention, such as Figure 1As shown, the low-voltage system 100 includes a controller 10 and a low-voltage high-power adjustable power supply 20. The controller 10 is connected to the low-voltage high-power adjustable power supply 20. The controller 10 is used to control the working state of the low-voltage high-power adjustable power supply 20 so that the low-voltage high-power adjustable power supply 20 outputs a preset voltage.

[0026] In some embodiments, the low-voltage system 100 also includes a bus capacitor (not shown), which is connected to the low-voltage, high-power, adjustable power supply 20, wherein the bus capacitor is used to store high voltage, and the low-voltage, high-power, adjustable power supply 20 is used to receive the bus voltage output by the bus capacitor, and process the bus voltage based on the drive signal of the controller 10, thereby outputting a preset voltage.

[0027] In yet another embodiment, Figure 1 As shown, the low-voltage high-power adjustable power supply 20 includes a phase-shifted full-bridge circuit 21 , a transformer module 22 , a filter module 23 and a magnetic integration device 24 .

[0028] The transformer module 22 includes a first transformer T1 and a second transformer T2. The primary winding of the first transformer T1 and the primary winding of the second transformer T2 are connected in series. The primary winding of the first transformer T1 and the primary winding of the second transformer T2 are also connected to the phase-shift full-bridge circuit 21 respectively. The secondary winding of the first transformer T1 and the secondary winding of the second transformer T2 are connected in parallel and connected to the magnetic integration device 24. The phase-shift full-bridge circuit 21 is used to receive the bus voltage. The magnetic integration device 24 is also connected to the filter module 23. The phase-shift full-bridge circuit 21 is also used to connect to the controller 10.

[0029] The phase-shifted full-bridge circuit 21 is used to receive the driving signal output by the controller 10, and convert the bus voltage based on the driving signal to output a corresponding first voltage signal to the transformer module 22;

[0030] The transformer module 22 is used to receive a first voltage signal, and convert the first voltage signal into a second voltage signal according to the turns ratio of the transformer module 22 , and then input the second voltage signal into the magnetic integration device 24 , so as to output the second voltage signal to the filter module 23 through the magnetic integration device 24 .

[0031] In some embodiments, the winding structure and turns ratio of the first transformer T1 are the same as the winding structure and turns ratio of the second transformer T2. It should be noted that the winding structure includes the number of turns and winding method of the transformer coil, and the winding structure and turns ratio of the first transformer T1 are set to the same winding structure and turns ratio as the second transformer T2, so that when the primary side (primary winding end) voltage of the first transformer T1 is the same as the primary side voltage of the second transformer T2, the secondary side (secondary winding end) voltage of the first transformer T1 and the secondary side voltage of the second transformer T2 are also the same.

[0032] Specifically, the phase-shifted full-bridge circuit 21 is also connected to the bus capacitor. When the phase-shifted full-bridge circuit 21 receives the driving signal output by the controller 10, it converts the bus voltage output by the bus capacitor based on the driving signal, thereby outputting a first voltage signal to the primary windings of the first transformer T1 and the second transformer T2. Since the primary winding of the first transformer T1 and the primary winding of the second transformer T2 are connected in series, and the winding structure and turn ratio of the first transformer T1 and the second transformer T2 are the same, the primary side of the first transformer T1 and the primary side of the second transformer T2 jointly divide the first voltage signal, and the voltages divided on the primary side of the first transformer T1 and the primary side of the second transformer T2 are the same; and based on the same turn ratio of the transformers, after the first transformer T1 and the second transformer T2 convert the first voltage signal into the second voltage signal, the second voltage signal output by the first transformer T1 is the same as the second voltage signal output by the second transformer T2. When the first transformer T1 and the second transformer T2 respectively output the second voltage signal, the magnetic integration device 24 processes the second voltage signal based on the control signal output by the controller 10 , and outputs the second voltage signal to the filter module 23 .

[0033] It should be noted that by connecting the primary winding of the first transformer T1 in series with the primary winding of the second transformer T2, and connecting the secondary winding of the first transformer T1 and the secondary winding of the second transformer T2 in parallel, the transmission power of the power supply is increased while making the current of the primary winding of the first transformer T1 and the primary winding of the second transformer T2 the same.

[0034] In yet another embodiment, see Figure 2a-2b , Figure 2a is a circuit diagram after the fifth switch tube and the eighth switch tube in a low-voltage high-power adjustable power supply provided by an embodiment of the present invention are turned on. Figure 2b 1 is a circuit diagram of a low-voltage, high-power adjustable power supply provided by an embodiment of the present invention after the sixth switch tube and the seventh switch tube are turned on. Figure 2a-2b As shown, the same-name end (A) of the primary winding of the first transformer T1 is located at the first position of the first transformer T1, and the same-name end (B) of the primary winding of the second transformer T2 is located at the first position of the second transformer T2.

[0035] The same-name end (a) of the secondary winding of the first transformer T1 is located at the second position of the first transformer T1, and the same-name end (b) of the secondary winding of the second transformer T2 is located at the second position of the second transformer T2.

[0036] It should be noted that by setting the same-name end of the first transformer T1 and the same-name end of the second transformer T2 at the same position of the corresponding transformer, the current of the secondary winding of the first transformer T1 and the current of the secondary winding of the second transformer T2 can be equal according to the same turns ratio of the transformers, thereby achieving current sharing of the two transformers.

[0037] In some embodiments, Figure 2a-2b As shown, the phase-shifted full-bridge circuit 21 includes a fifth switch tube Q1, a sixth switch tube Q2, a seventh switch tube Q3, an eighth switch tube Q4, a diode D1, a diode D2, a diode D3, a diode D4, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4 and an inductor Lr. The diode D1, the diode D2, the diode D3 and the diode D4 are body diodes corresponding to the switch tubes, the capacitor C1, the capacitor C2, the capacitor C3 and the capacitor C4 are the sum of the parasitic capacitance corresponding to the switch tubes and the external parallel capacitance, and the inductor Lr is the sum of the leakage inductance of the first transformer T1 and the second transformer T2 and the external inductance.

[0038] Specifically, Figure 2a As shown, when the bus capacitance (C in ) output voltage and the controller 10 outputs a driving signal to the fifth switch tube Q1 and the eighth switch tube Q4, the fifth switch tube Q1 and the eighth switch tube Q4 are turned on. At this time, the bus voltage will flow into the primary winding of the first transformer T1 and the primary winding of the second transformer T2 through the fifth switch tube Q1, and then flow into the ground terminal (the negative electrode of the bus capacitor) through the eighth switch tube Q4. Among them, since the winding structure and turn ratio of the first transformer T1 and the second transformer T2 are the same, the voltage on the primary winding of the first transformer T1 and the primary winding of the second transformer T2 are the same.

[0039] It is known that if Figure 2a As shown, according to the positions of the like-named ends of the first transformer T1 and the second transformer T2, when the fifth switch tube Q1 and the eighth switch tube Q4 are turned on, the like-named ends of the primary winding of the first transformer T1 and the like-named ends of the primary winding of the second transformer T2 are both positive voltages, so the like-named ends of the secondary winding of the first transformer T1 and the like-named ends of the secondary winding of the second transformer T2 are also positive voltages, and the voltage of the secondary winding of the first transformer T1 is the same as the voltage of the secondary winding of the second transformer T2.

[0040] In some embodiments, Figure 2b As shown, when the bus capacitor outputs the bus voltage and the controller 10 outputs a driving signal to the control end of the sixth switch tube Q2 and the seventh switch tube Q3, the sixth switch tube Q2 and the seventh switch tube Q3 are turned on, and the bus voltage flows into the second transformer T2 through the sixth switch tube Q2, and then flows into the first transformer T1 from the second transformer T2, and finally flows into the ground end based on the seventh switch tube Q3. At this time, the voltages of the primary winding same-name end of the first transformer T1, the secondary winding same-name end of the first transformer T1, the primary winding same-name end of the second transformer T2, and the secondary winding same-name end of the second transformer T2 are all negative voltages.

[0041] It should be noted that the controller 10 mainly adopts the idea of ​​upper tube modulation when outputting the driving signal, but in this description, the driving signal with a duty cycle of 50% is used to drive the lower tube, that is, the duty cycle of the driving signal of the seventh switch tube Q3 and the eighth switch tube Q4 is set to 50%, so that the seventh switch tube Q3 and the eighth switch tube Q4 are alternately turned on, and the turn-on time is consistent, thereby achieving the purpose of adjusting the output voltage by adjusting the pulse width of the driving signal of the fifth switch tube Q1 and the sixth switch tube Q2. Among them, by setting the duty cycle of the driving signal of the seventh switch tube Q3 and the eighth switch tube Q4 to 50%, the reliability of the power supply of the upper tube driving circuit can be guaranteed. It can be known that the phase-shifted full-bridge circuit 21 mainly realizes the output of positive and negative voltages by controlling the duty cycle of the upper tube driving signal. Therefore, the output voltage can be adjusted by adjusting the duty cycle of the upper tube driving signal.

[0042] In another embodiment, there are other implementation methods for the phase-shifted full-bridge circuit 21 to output positive voltage or negative voltage based on the first transformer T1 and the second transformer T2, such as through a body diode, a parasitic capacitor, etc. The principle is similar to the above-mentioned principle of implementation through a switching tube, and will not be repeated here.

[0043] In another embodiment, see Figure 3-Figure 4 , Figure 3 is a structural block diagram of a magnetic integration device provided by an embodiment of the present invention, Figure 4 is a schematic diagram of an inductor module provided by an embodiment of the present invention, such as Figure 3 As shown, the magnetic integration device 24 includes a first magnetic ring 241, a second magnetic ring 242, a first inductance module L1 and a second inductance module L2, wherein the first inductance module L1 includes a first coil n1 and a second coil n2, the second inductance module L2 includes a third coil n3 and a fourth coil n4, the first coil n1 and the second coil n2 are coupled to each other, and the third coil n3 and the fourth coil n4 are coupled to each other.

[0044] Combination Figure 4 and Figure 2a-2b , the first coil n1 and the second coil n2 are both wound on the first magnetic ring 241, and the third coil n3 and the fourth coil n4 are both wound on the second magnetic ring 242. The first coil n1 and the third coil n3 are also connected to the secondary winding of the first transformer T1, respectively, and the second coil n2 and the fourth coil n4 are also connected to the secondary winding of the second transformer T2, respectively, wherein the first coil n1 is connected to the same-name end of the secondary winding of the first transformer T1, and the second coil n2 is connected to the same-name end of the secondary winding of the second transformer T2.

[0045] The first inductor module L1 is configured such that when the like-name ends of the secondary windings of the first transformer T1 and the second transformer T2 output a positive voltage, the current flowing through the first inductor module L1 gradually increases, and when the like-name ends of the secondary windings of the first transformer T1 and the second transformer T2 output a negative voltage, the current flowing through the first inductor module L1 gradually decreases.

[0046] The second inductor module L2 is configured such that when the non-like-name ends of the secondary windings of the first transformer T1 and the second transformer T2 output a positive voltage, the current flowing through the second inductor module L2 gradually increases, and when the non-like-name ends of the secondary windings of the first transformer T1 and the second transformer T2 output a negative voltage, the current flowing through the second inductor module L2 gradually decreases.

[0047] It can be known that when the first coil n1, the second coil n2, the third coil n3 and the fourth coil n4 are all discrete inductors, if the first transformer T1 and the second transformer T2 output voltage to the first coil n1 and the second coil n2, the first coil n1 and the second coil n2 will not only be coupled with each other, but may also be coupled with the third coil n3, the first transformer T1 and the second transformer T2, thereby causing voltage oscillations at both ends of the windings of the first transformer T1 and the second transformer T2, thereby causing unstable output parameters. The present application winds the first coil n1 and the second coil n2 connected to the same-name end of the first transformer T1 and the same-name end of the second transformer T2 on the same magnetic ring (first magnetic ring 241), and winds the third coil n3 and the fourth coil n4 connected to the non-same-name end of the first transformer T1 and the non-same-name end of the second transformer T2 on the same magnetic ring (second magnetic ring 242), thereby utilizing the magnetic coupling of the first coil n1 and the second coil n2 and the magnetic coupling of the third coil n3 and the fourth coil n4 to eliminate the voltage oscillation of the secondary winding of the first transformer T1 and the secondary winding of the second transformer T2, thereby enabling the low-voltage, high-power adjustable power supply to stably output a preset voltage.

[0048] In some embodiments, Figure 3 As shown, the magnetic integration device 24 further includes a switch module 243, which is respectively connected to the first transformer T1 and the second transformer T2, and is also respectively connected to the first coil n1, the second coil n2, the third coil n3 and the fourth coil n4.

[0049] The switch module 243 responds to the positive voltage outputted from the like-named ends of the secondary windings of the first transformer T1 and the second transformer T2, and applies the positive voltage to the first coil n1 and the second coil n2, so that the current flowing through the first coil n1 and the second coil n2 gradually increases under the action of the positive voltage, so as to output the current to the filter module 23 through the first coil n1 and the second coil n2; and responds to the positive voltage outputted from the non-like-named ends of the secondary windings of the first transformer T1 and the second transformer T2, and applies the positive voltage to the third coil n3 and the fourth coil n4, so that the current flowing through the third coil n3 and the fourth coil n4 gradually increases under the action of the positive voltage, so as to output the current to the filter module 23 through the third coil n3 and the fourth coil n4.

[0050] Specifically, when the same-name ends of the secondary windings of the first transformer T1 and the second transformer T2 output positive voltages, the switch module 243 will also receive the control signal output by the controller 10, and input the positive voltage into the first inductor module L1 based on the control signal, so that the current in the first inductor module L1 gradually increases. After the current flows through the first inductor module L1, it will be output to the filter module 23, so that the filter module 23 outputs a preset voltage. When the non-same-name ends of the secondary windings of the first transformer T1 and the second transformer T2 output positive voltages, the controller 10 will output a control signal to the switch module 243, so that the current in the second inductor module L2 gradually increases, and then the current is output to the filter module 23 through the second inductor module L2.

[0051] In some embodiments, the switch module 243 is used to control the current on the first coil n1 and the current on the second coil n2 to increase according to a preset increment, and the current on the third coil n3 and the current on the fourth coil n4 to decrease according to a preset decrease amount according to the positive voltage output from the like-name ends of the secondary windings of the first transformer T1 and the second transformer T2; and to control the current on the first coil n1 and the current on the second coil n2 to decrease according to a preset decrease amount, and the current on the third coil n3 and the current on the fourth coil n4 to increase according to a preset increment according to the positive voltage output from the non-like-name ends of the secondary windings of the first transformer T1 and the second transformer T2.

[0052] It should be noted that the same-name ends of the secondary windings of the first transformer T1 and the second transformer T2 will alternately output positive and negative voltages. When the same-name ends output positive voltages, the non-same-name ends will output negative voltages, and vice versa. Therefore, when the same-name ends of the secondary windings of the first transformer T1 and the second transformer T2 output positive voltages, since the current on the inductor cannot change suddenly, the current flowing through the first inductor module L1 gradually increases under the action of the positive voltage, and the current flowing through the second inductor module L2 gradually decreases under the action of the negative voltage. Conversely, when the non-same-name ends of the secondary windings of the first transformer T1 and the second transformer T2 output positive voltages, the current on the first inductor module L1 gradually decreases, and the current on the second inductor module L2 gradually increases. Based on this, the output voltage of the filter module 23 can be set to a preset voltage based on the first inductor module L1 and the second inductor module L2.

[0053] In some embodiments, the first coil n1 and the second coil n2 are wound in the same direction on the first magnetic ring 241 ; the third coil n3 and the fourth coil n4 are wound in the same direction on the second magnetic ring 242 .

[0054] In another embodiment, the number of turns and inductance of the first coil n1 are the same as those of the second coil n2; the number of turns and inductance of the third coil n3 are the same as those of the fourth coil n4.

[0055] In another embodiment, if Figure 2a-2b As shown, the filter module 23 is a capacitor Co, which is connected to the first inductor module L1 and the second inductor module L2 respectively, and is also used for grounding. The capacitor Co is used to receive the voltage signal output by the first inductor module L1 and / or the second inductor module L2.

[0056] In some embodiments, Figure 2a-2b As shown, the switch module 243 includes a first switch tube Q5, a second switch tube Q6, a third switch tube Q7 and a fourth switch tube Q8;

[0057] The first end of the first switch tube Q5 is connected to the same-name end of the secondary winding of the first transformer T1 and the first coil n1 respectively, the second end of the first switch tube Q5 is connected to the first end of the second switch tube Q6, the second end of the first switch tube Q5 is also connected to the filter module 23, the second end of the second switch tube Q6 is connected to the non-same-name end of the secondary winding of the first transformer T1 and the third coil n3 respectively, the first end of the third switch tube Q7 is connected to the same-name end of the secondary winding of the second transformer T2 and the second coil n2 respectively, the second end of the third switch tube Q7 is connected to the first end of the fourth switch tube Q8, the second end of the third switch tube Q7 is also connected to the filter module 23, the second end of the fourth switch tube Q8 is connected to the fourth coil n4 and the non-same-name end of the secondary winding of the second transformer T2 respectively, and the first switch tube Q5, the second switch tube Q6, the third switch tube Q7 and the fourth switch tube Q8 are also connected to the controller 10.

[0058] The first switch tube Q5, the second switch tube Q6, the third switch tube Q7 and the fourth switch tube Q8 are all used to receive the control signal output by the controller 10, and are alternately turned on according to the control signal, wherein the on-off state of the first switch tube Q5 is the same as that of the third switch tube Q7, the on-off state of the second switch tube Q6 is the same as that of the fourth switch tube Q8, and the first switch tube Q5 and the second switch tube Q6 are alternately turned on.

[0059] Specifically, Figure 2a As shown, when the same-name end of the secondary winding of the first transformer T1 and the second transformer T2 outputs a positive voltage, the second switch tube Q6 and the fourth switch tube Q8 will also receive a control signal and be turned on based on the control signal. When the same-name end of the secondary winding of the first transformer T1 outputs a positive voltage, the positive voltage will be input to the positive electrode of the capacitor Co through the same-name end of the first transformer T1 and the first coil n1, and then return to the non-same-name end of the first transformer T1 through the negative electrode of the capacitor Co and the second switch tube Q6; at the same time, the positive voltage of the same-name end of the secondary winding of the second transformer T2 will also flow into the second coil n2 through the same-name end of the second transformer T2, and input to the positive electrode of the capacitor Co through the second coil n2, and then flow back to the non-same-name end of the second transformer T2 through the capacitor Co and the fourth switch tube Q8.

[0060] In some embodiments, Figure 2bAs shown, when the non-same-named ends of the secondary windings of the first transformer T1 and the second transformer T2 output positive voltages, the first switch tube Q5 and the third switch tube Q7 will also receive a control signal and be turned on based on the control signal. At this time, the positive voltage will return to the same-named end of the first transformer T1 through the non-same-named end of the first transformer T1, the third coil n3, the capacitor Co, and the first switch tube Q5; at the same time, the positive voltage output from the non-same-named end of the second transformer T2 will flow back to the same-named end of the second transformer T2 through the fourth coil n4, the capacitor Co, and the third switch tube Q7. Based on this, when the secondary windings of the first transformer T1 and the second transformer T2 output positive and negative voltages, they can be output to the filter module 23, so that the low-voltage high-power adjustable power supply can output a preset voltage in real time.

[0061] An embodiment of the present invention provides a magnetic integrated device, which includes a first magnetic ring, a second magnetic ring, a first inductance module and a second inductance module; the first inductance module includes a first coil and a second coil, the second inductance module includes a third coil and a fourth coil, the first coil and the second coil are coupled to each other, and the third coil and the fourth coil are coupled to each other; the first coil and the second coil are both wound on the first magnetic ring, the third coil and the fourth coil are both wound on the second magnetic ring, the first coil and the third coil are also respectively connected to the secondary winding of the first transformer, the second coil and the fourth coil are also respectively connected to the secondary winding of the second transformer, wherein the first coil is connected to the same-name end of the secondary winding of the first transformer, and the second coil is connected to the same-name end of the secondary winding of the second transformer. By winding the first coil and the second coil connected to the same-name ends of the secondary windings of the first transformer and the second transformer on the same magnetic ring, and winding the third coil and the fourth coil connected to the non-same-name ends of the secondary windings of the first transformer and the second transformer on the same magnetic ring, the voltage oscillation at both ends of the windings of the first transformer and the second transformer can be eliminated through the magnetic coupling of the first coil and the second coil and the magnetic coupling of the third coil and the fourth coil.

[0062] The first inductor module is configured such that when the same-name end of the secondary winding of the first transformer and the second transformer outputs a positive voltage, the current of the first inductor module gradually increases under the action of the positive voltage, and when the same-name end of the secondary winding of the first transformer and the second transformer outputs a negative voltage, the current of the first inductor module gradually decreases under the action of the negative voltage; the second inductor module is configured such that when the non-same-name end of the secondary winding of the first transformer and the second transformer outputs a positive voltage, the second inductor module gradually increases under the action of the positive voltage, and when the non-same-name end of the secondary winding of the first transformer and the second transformer outputs a negative voltage, the second inductor module gradually decreases under the action of the negative voltage. The magnetic coupling of the first coil and the second coil in the first inductor module and the magnetic coupling of the third coil and the fourth coil in the second inductor module. Based on this, the voltage oscillation at both ends of the first transformer winding can be eliminated while outputting a preset voltage.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Under the concept of the present invention, the technical features in the above embodiments or different embodiments may also be combined, the steps may be implemented in any order, and there are many other changes in different aspects of the present invention as above, which are not provided in detail for the sake of simplicity. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they may still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A magnetic integration device, characterized in that: Applicable to a low-voltage high-power adjustable power supply, the low-voltage high-power adjustable power supply comprises a first transformer and a second transformer, the magnetic integration device comprises a first magnetic ring, a second magnetic ring, a first inductor module and a second inductor module; The first inductor module includes a first coil and a second coil, the second inductor module includes a third coil and a fourth coil, the first coil and the second coil are coupled to each other, and the third coil and the fourth coil are coupled to each other; The first coil and the second coil are both wound on the first magnetic ring, the third coil and the fourth coil are both wound on the second magnetic ring, the first coil and the third coil are also respectively connected to the secondary winding of the first transformer, the second coil and the fourth coil are also respectively connected to the secondary winding of the second transformer, wherein the first coil is connected to the same-name end of the secondary winding of the first transformer, and the second coil is connected to the same-name end of the secondary winding of the second transformer; The first inductor module is configured such that when the same-named ends of the secondary windings of the first transformer and the second transformer output a positive voltage, the current flowing through the first inductor module gradually increases, and when the same-named ends of the secondary windings of the first transformer and the second transformer output a negative voltage, the current flowing through the first inductor module gradually decreases; The second inductor module is configured such that when the non-like-name ends of the secondary windings of the first transformer and the second transformer output positive voltages, the current flowing through the second inductor module gradually increases, and when the non-like-name ends of the secondary windings of the first transformer and the second transformer output negative voltages, the current flowing through the second inductor module gradually decreases.

2. The magnetic integration device according to claim 1, characterized in that: The low-voltage high-power adjustable power supply further includes a filter module, the filter module is connected to the first inductor module and the second inductor module, and the magnetic integration device further includes a switch module; The switch module is connected to the first transformer and the second transformer respectively, and the switch module is also connected to the first coil, the second coil, the third coil and the fourth coil respectively; The switch module responds to the positive voltage outputted by the same-named ends of the secondary windings of the first transformer and the second transformer, the positive voltage is applied to the first coil and the second coil, and the current flowing through the first coil and the second coil gradually increases under the action of the positive voltage, so as to output the current to the filter module through the first coil and the second coil; In response to the positive voltage outputted from the non-same-name ends of the secondary windings of the first transformer and the second transformer, the positive voltage is applied to the third coil and the fourth coil, and the current flowing through the third coil and the fourth coil gradually increases under the action of the positive voltage, so as to output the current to the filter module through the third coil and the fourth coil.

3. The magnetic integrated device according to claim 2, characterized in that: The switch module is used to control the current on the first coil and the current on the second coil to increase according to a preset increment and the current on the third coil and the current on the fourth coil to decrease according to a preset decrease according to the positive voltage output from the same-name end of the secondary winding; and to control the current on the first coil and the current on the second coil to decrease according to a preset decrease and the current on the third coil and the current on the fourth coil to increase according to a preset increment according to the positive voltage output from the non-same-name end of the secondary winding.

4. The magnetic integration device according to claim 2 or 3, characterized in that: The switch module includes a first switch tube, a second switch tube, a third switch tube and a fourth switch tube; The first end of the first switch tube is connected to the same-name end of the secondary winding of the first transformer and the first coil respectively, the second end of the first switch tube is connected to the first end of the second switch tube, the second end of the first switch tube is also connected to the filter module, the second end of the second switch tube is connected to the non-same-name end of the secondary winding of the first transformer and the third coil respectively, the first end of the third switch tube is connected to the same-name end of the secondary winding of the second transformer and the second coil respectively, the second end of the third switch tube is connected to the first end of the fourth switch tube, the second end of the third switch tube is also connected to the filter module, the second end of the fourth switch tube is connected to the fourth coil and the non-same-name end of the secondary winding of the second transformer respectively, and the first switch tube, the second switch tube, the third switch tube and the fourth switch tube are also connected to the controller; The first switch tube, the second switch tube, the third switch tube and the fourth switch tube are all used to receive the control signal output by the controller and are alternately turned on according to the control signal, wherein the on-off state of the first switch tube is the same as that of the third switch tube, the on-off state of the second switch tube is the same as that of the fourth switch tube, and the first switch tube and the second switch tube are alternately turned on.

5. The magnetic integrated device according to any one of claims 1 to 3, characterized in that: The first coil and the second coil are wound in the same direction on the first magnetic ring; The third coil and the fourth coil are wound in the same direction on the second magnetic ring.

6. The magnetic integrated device according to any one of claims 1 to 3, characterized in that: The number of turns and the inductance of the first coil are the same as the number of turns and the inductance of the second coil; The number of turns and the inductance of the third coil are the same as the number of turns and the inductance of the fourth coil.

7. A low voltage, high power adjustable power supply, characterized in that: The low-voltage high-power adjustable power supply comprises a phase-shifted full-bridge circuit, a transformer module, a filter module and a magnetic integrated device as described in any one of claims 1 to 6; The transformer module includes a first transformer and a second transformer, the primary winding of the first transformer and the primary winding of the second transformer are connected in series, the primary winding of the first transformer and the primary winding of the second transformer are also connected to the phase-shifted full-bridge circuit respectively, the secondary winding of the first transformer and the secondary winding of the second transformer are connected in parallel to each other and connected to the magnetic integration device, the phase-shifted full-bridge circuit is used to receive the bus voltage, the magnetic integration device is also connected to the filter module, and the phase-shifted full-bridge circuit is also used to connect to the controller; The phase-shifted full-bridge circuit is used to receive the driving signal output by the controller, and convert the bus voltage based on the driving signal to output a corresponding first voltage signal to the transformer module; The transformer module is used to receive the first voltage signal, and convert the first voltage signal into a second voltage signal according to the turns ratio of the transformer module, and then input the second voltage signal into the magnetic integration device, so as to output the second voltage signal to the filter module through the magnetic integration device.

8. The low-voltage, high-power adjustable power supply according to claim 7, characterized in that: The same-named end of the primary winding of the first transformer is located at a first position of the first transformer, and the same-named end of the primary winding of the second transformer is located at a first position of the second transformer; The same-name end of the secondary winding of the first transformer is located at the second position of the first transformer, and the same-name end of the secondary winding of the second transformer is located at the second position of the second transformer.

9. The low-voltage, high-power adjustable power supply according to claim 7, characterized in that: The winding structure and turns ratio of the first transformer are the same as those of the second transformer.

10. A low pressure system, characterized in that: The low pressure system comprises: Controller; and a low-voltage, high-power adjustable power supply as described in any one of claims 7-9.

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